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2422 2423 2424 2425 2426 2427 2428 | /*
* Universal Host Controller Interface driver for USB.
*
* (C) Copyright 1999 Linus Torvalds
* (C) Copyright 1999 Johannes Erdfelt
* (C) Copyright 1999 Randy Dunlap
*
* Intel documents this fairly well, and as far as I know there
* are no royalties or anything like that, but even so there are
* people who decided that they want to do the same thing in a
* completely different way.
*
* Oh, well. The intel version is the more common by far. As such,
* that's the one I care about right now.
*
* WARNING! The USB documentation is downright evil. Most of it
* is just crap, written by a committee. You're better off ignoring
* most of it, the important stuff is:
* - the low-level protocol (fairly simple but lots of small details)
* - working around the horridness of the rest
*/
/* 4/4/1999 added data toggle for interrupt pipes -keryan */
/* 5/16/1999 added global toggles for bulk and control */
/* 6/25/1999 added fix for data toggles on bidirectional bulk endpoints */
/*
* 1999-09-02: Thomas Sailer <sailer@ife.ee.ethz.ch>
* Added explicit frame list manipulation routines
* for inserting/removing iso td's to/from the frame list.
* START_ABSOLUTE fixes
*/
#include <linux/config.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/kernel.h>
#include <linux/delay.h>
#include <linux/ioport.h>
#include <linux/sched.h>
#include <linux/malloc.h>
#include <linux/smp_lock.h>
#include <linux/errno.h>
#include <linux/unistd.h>
#include <linux/spinlock.h>
#include <asm/uaccess.h>
#include <asm/io.h>
#include <asm/irq.h>
#include <asm/system.h>
#include "uhci.h"
#ifdef CONFIG_APM
#include <linux/apm_bios.h>
static int handle_apm_event(apm_event_t event);
static int apm_resume = 0;
#endif
static int uhci_debug = 1;
#define compile_assert(x) do { switch (0) { case 1: case !(x): } } while (0)
static DECLARE_WAIT_QUEUE_HEAD(uhci_configure);
static kmem_cache_t *uhci_td_cachep;
static kmem_cache_t *uhci_qh_cachep;
static LIST_HEAD(uhci_list);
#define UHCI_DEBUG
/*
* function prototypes
*/
static int uhci_get_current_frame_number (struct usb_device *usb_dev);
static int uhci_init_isoc (struct usb_device *usb_dev,
unsigned int pipe,
int frame_count,
void *context,
struct usb_isoc_desc **isocdesc);
static void uhci_free_isoc (struct usb_isoc_desc *isocdesc);
static int uhci_run_isoc (struct usb_isoc_desc *isocdesc,
struct usb_isoc_desc *pr_isocdesc);
static int uhci_kill_isoc (struct usb_isoc_desc *isocdesc);
/*
* Map status to standard result codes
*
* <status> is (td->status & 0xFE0000) [a.k.a. uhci_status_bits(td->status)]
* <dir_out> is True for output TDs and False for input TDs.
*/
static int uhci_map_status(int status, int dir_out)
{
if (!status)
return USB_ST_NOERROR;
if (status & TD_CTRL_BITSTUFF) /* Bitstuff error */
return USB_ST_BITSTUFF;
if (status & TD_CTRL_CRCTIMEO) { /* CRC/Timeout */
if (dir_out)
return USB_ST_NORESPONSE;
else
return USB_ST_CRC;
}
if (status & TD_CTRL_NAK) /* NAK */
return USB_ST_TIMEOUT;
if (status & TD_CTRL_BABBLE) /* Babble */
return USB_ST_STALL;
if (status & TD_CTRL_DBUFERR) /* Buffer error */
return USB_ST_BUFFERUNDERRUN;
if (status & TD_CTRL_STALLED) /* Stalled */
return USB_ST_STALL;
if (status & TD_CTRL_ACTIVE) /* Active */
return USB_ST_NOERROR;
return USB_ST_INTERNALERROR;
}
/*
* Return the result of a TD..
*/
static int uhci_td_result(struct uhci_device *dev, struct uhci_td *td, unsigned long *rval, int debug)
{
unsigned int status;
struct uhci_td *tmp;
int count = 1000, actlength, explength;
if (rval)
*rval = 0;
/* Start at the TD first in the chain, if possible */
if (td->qh && td->qh->first)
tmp = td->qh->first;
else
tmp = td;
if (!tmp)
return USB_ST_INTERNALERROR;
/* Locate the first failing td, if any */
do {
status = uhci_status_bits(tmp->status);
if (status)
break;
/* The length field is only valid if the TD was completed */
if (!(tmp->status & TD_CTRL_ACTIVE) && uhci_packetin(tmp->info)) {
explength = uhci_expected_length(tmp->info);
actlength = uhci_actual_length(tmp->status);
if (rval)
*rval += actlength;
/* This check is bogus, at least for acm. It
always expects 64, but gets as many bytes
as available (typically 1) -- pavel */
if (0 && (explength != actlength)) {
/* Reset the data toggle on error. */
if (debug || uhci_debug)
printk(KERN_DEBUG "Set toggle from %p rval %ld%c for status=%x to %d, exp=%d, act=%d\n",
tmp, rval ? *rval : 0,
rval ? '*' : '/', tmp->status,
uhci_toggle(tmp->info) ^ 1,
explength, actlength);
usb_settoggle(dev->usb, uhci_endpoint(tmp->info),
uhci_packetout(tmp->info),
uhci_toggle(tmp->info) ^ 1);
break; // Short packet
}
}
if ((tmp->link & UHCI_PTR_TERM) ||
(tmp->link & UHCI_PTR_QH))
break;
tmp = uhci_ptr_to_virt(tmp->link);
} while (--count);
if (!count) {
printk(KERN_ERR "runaway td's in uhci_td_result!\n");
/* Force debugging on */
debug = 1;
} else {
/* If we got to the last TD */
/* No error */
if (!status)
return USB_ST_NOERROR;
/* APC BackUPS Pro kludge */
/* It tries to send all of the descriptor instead of */
/* the amount we requested */
if (tmp->status & TD_CTRL_IOC &&
tmp->status & TD_CTRL_ACTIVE &&
tmp->status & TD_CTRL_NAK &&
tmp->pipetype == PIPE_CONTROL)
return USB_ST_NOERROR;
/* We got to an error, but the controller hasn't finished */
/* with it yet. */
if (tmp->status & TD_CTRL_ACTIVE)
return USB_ST_NOCHANGE;
/* If this wasn't the last TD and SPD is set, ACTIVE */
/* is not and NAK isn't then we received a short */
/* packet */
if (tmp->status & TD_CTRL_SPD && !(tmp->status & TD_CTRL_NAK))
return USB_ST_NOERROR;
}
/* Some debugging code */
if (debug && uhci_debug) {
printk(KERN_DEBUG "uhci_td_result() failed with status %x\n",
status);
/* Print the chain for debugging purposes */
if (td->qh)
uhci_show_queue(td->qh);
else
uhci_show_td(td);
}
if (status & TD_CTRL_STALLED) {
/* endpoint has stalled - mark it halted */
usb_endpoint_halt(dev->usb, uhci_endpoint(tmp->info),
uhci_packetout(tmp->info));
return USB_ST_STALL;
}
if ((status == TD_CTRL_ACTIVE) && (!rval))
return USB_ST_DATAUNDERRUN;
return uhci_map_status(status, uhci_packetout(tmp->info));
}
/*
* Inserts a td into qh list at the top.
*
* Careful about atomicity: even on UP this
* requires a locked access due to the concurrent
* DMA engine.
*
* NOTE! This assumes that first->last is a valid
* list of TD's with the proper backpointers set
* up and all..
*/
static void uhci_insert_tds_in_qh(struct uhci_qh *qh, struct uhci_td *first, struct uhci_td *last)
{
unsigned int link = qh->element;
unsigned int new = virt_to_bus(first) | UHCI_PTR_DEPTH;
for (;;) {
unsigned char success;
last->link = link;
first->backptr = &qh->element;
asm volatile("lock ; cmpxchg %4,%2 ; sete %0"
:"=q" (success), "=a" (link)
:"m" (qh->element), "1" (link), "r" (new)
:"memory");
if (success) {
/* Was there a successor entry? Fix it's backpointer */
if ((link & UHCI_PTR_TERM) == 0) {
struct uhci_td *next = uhci_ptr_to_virt(link);
next->backptr = &last->link;
}
break;
}
}
qh->first = first;
first->qh = qh;
last->qh = qh;
}
static inline void uhci_insert_td_in_qh(struct uhci_qh *qh, struct uhci_td *td)
{
uhci_insert_tds_in_qh(qh, td, td);
}
static void uhci_insert_qh(struct uhci_qh *qh, struct uhci_qh *newqh)
{
newqh->link = qh->link;
qh->link = virt_to_bus(newqh) | UHCI_PTR_QH;
}
static void uhci_remove_qh(struct uhci_qh *qh, struct uhci_qh *remqh)
{
struct uhci_qh *lqh = qh;
while (uhci_ptr_to_virt(lqh->link) != remqh) {
if (lqh->link & UHCI_PTR_TERM)
break;
lqh = uhci_ptr_to_virt(lqh->link);
}
if (lqh->link & UHCI_PTR_TERM) {
printk(KERN_DEBUG "couldn't find qh in chain!\n");
return;
}
lqh->link = remqh->link;
}
/*
* Removes td from qh if present.
*
* NOTE! We keep track of both forward and back-pointers,
* so this should be trivial, right?
*
* Wrong. While all TD insert/remove operations are synchronous
* on the CPU, the UHCI controller can (and does) play with the
* very first forward pointer. So we need to validate the backptr
* before we change it, so that we don't by mistake reset the QH
* head to something old.
*/
static void uhci_remove_td(struct uhci_td *td)
{
unsigned int *backptr = td->backptr;
unsigned int link = td->link;
unsigned int me;
if (!backptr)
return;
td->backptr = NULL;
/*
* This is the easy case: the UHCI will never change "td->link",
* so we can always just look at that and fix up the backpointer
* of any next element..
*/
if (!(link & UHCI_PTR_TERM)) {
struct uhci_td *next = uhci_ptr_to_virt(link);
next->backptr = backptr;
}
/*
* The nasty case is "backptr->next", which we need to
* update to "link" _only_ if "backptr" still points
* to us (it may not: maybe backptr is a QH->element
* pointer and the UHCI has changed the value).
*/
me = virt_to_bus(td) | (0xe & *backptr);
asm volatile("lock ; cmpxchg %0,%1"
:
:"r" (link), "m" (*backptr), "a" (me)
:"memory");
/* Reset it just in case */
td->link = UHCI_PTR_TERM;
}
/*
* Only the USB core should call uhci_alloc_dev and uhci_free_dev
*/
static int uhci_alloc_dev(struct usb_device *usb_dev)
{
struct uhci_device *dev;
/* Allocate the UHCI device private data */
dev = kmalloc(sizeof(*dev), GFP_KERNEL);
if (!dev)
return -1;
/* Initialize "dev" */
memset(dev, 0, sizeof(*dev));
usb_dev->hcpriv = dev;
dev->usb = usb_dev;
atomic_set(&dev->refcnt, 1);
if (usb_dev->parent)
dev->uhci = usb_to_uhci(usb_dev->parent)->uhci;
return 0;
}
static int uhci_free_dev(struct usb_device *usb_dev)
{
struct uhci_device *dev = usb_to_uhci(usb_dev);
if (atomic_dec_and_test(&dev->refcnt))
kfree(dev);
return 0;
}
static void uhci_inc_dev_use(struct uhci_device *dev)
{
atomic_inc(&dev->refcnt);
}
static void uhci_dec_dev_use(struct uhci_device *dev)
{
uhci_free_dev(dev->usb);
}
static struct uhci_td *uhci_td_alloc(struct uhci_device *dev)
{
struct uhci_td *td;
td = kmem_cache_alloc(uhci_td_cachep, SLAB_KERNEL);
if (!td)
return NULL;
#ifdef UHCI_DEBUG
if ((__u32)td & UHCI_PTR_BITS)
printk("qh not 16 byte aligned!\n");
#endif
td->link = UHCI_PTR_TERM;
td->buffer = 0;
td->backptr = NULL;
td->qh = NULL;
td->dev_id = NULL;
td->dev = dev;
td->flags = 0;
INIT_LIST_HEAD(&td->irq_list);
atomic_set(&td->refcnt, 1);
uhci_inc_dev_use(dev);
return td;
}
static void uhci_td_free(struct uhci_td *td)
{
if (atomic_dec_and_test(&td->refcnt)) {
kmem_cache_free(uhci_td_cachep, td);
if (td->dev)
uhci_dec_dev_use(td->dev);
}
}
static struct uhci_qh *uhci_qh_alloc(struct uhci_device *dev)
{
struct uhci_qh *qh;
qh = kmem_cache_alloc(uhci_qh_cachep, SLAB_KERNEL);
if (!qh)
return NULL;
#ifdef UHCI_DEBUG
if ((__u32)qh & UHCI_PTR_BITS)
printk("qh not 16 byte aligned!\n");
#endif
qh->element = UHCI_PTR_TERM;
qh->link = UHCI_PTR_TERM;
qh->dev = dev;
qh->skel = NULL;
qh->first = NULL;
init_waitqueue_head(&qh->wakeup);
atomic_set(&qh->refcnt, 1);
uhci_inc_dev_use(dev);
return qh;
}
static void uhci_qh_free(struct uhci_qh *qh)
{
if (atomic_dec_and_test(&qh->refcnt)) {
kmem_cache_free(uhci_qh_cachep, qh);
if (qh->dev)
uhci_dec_dev_use(qh->dev);
}
}
/*
* UHCI interrupt list operations..
*/
static spinlock_t irqlist_lock = SPIN_LOCK_UNLOCKED;
static void uhci_add_irq_list(struct uhci *uhci, struct uhci_td *td, usb_device_irq completed, void *dev_id)
{
unsigned long flags;
td->completed = completed;
td->dev_id = dev_id;
spin_lock_irqsave(&irqlist_lock, flags);
list_add(&td->irq_list, &uhci->interrupt_list);
spin_unlock_irqrestore(&irqlist_lock, flags);
}
static void uhci_remove_irq_list(struct uhci_td *td)
{
unsigned long flags;
spin_lock_irqsave(&irqlist_lock, flags);
list_del(&td->irq_list);
spin_unlock_irqrestore(&irqlist_lock, flags);
}
/*
* frame list manipulation. Used for Isochronous transfers.
* the list of (iso) TD's enqueued in a frame list entry
* is basically a doubly linked list with link being
* the forward pointer and backptr the backward ptr.
* the frame list entry itself doesn't have a back ptr
* (therefore the list is not circular), and the forward pointer
* stops at link entries having the UHCI_PTR_TERM or the UHCI_PTR_QH
* bit set. Maybe it could be extended to handle the QH's also,
* but it doesn't seem necessary right now.
* The layout looks as follows:
* frame list pointer -> iso td's (if any) ->
* periodic interrupt td (if framelist 0) -> irq qh -> control qh -> bulk qh
*/
static spinlock_t framelist_lock = SPIN_LOCK_UNLOCKED;
static void uhci_add_frame_list(struct uhci *uhci, struct uhci_td *td, unsigned framenum)
{
unsigned long flags;
struct uhci_td *nexttd;
framenum %= UHCI_NUMFRAMES;
spin_lock_irqsave(&framelist_lock, flags);
td->backptr = &uhci->fl->frame[framenum];
td->link = uhci->fl->frame[framenum];
if (!(td->link & (UHCI_PTR_TERM | UHCI_PTR_QH))) {
nexttd = (struct uhci_td *)uhci_ptr_to_virt(td->link);
nexttd->backptr = &td->link;
}
wmb();
uhci->fl->frame[framenum] = virt_to_bus(td);
spin_unlock_irqrestore(&framelist_lock, flags);
}
static void uhci_remove_frame_list(struct uhci *uhci, struct uhci_td *td)
{
unsigned long flags;
struct uhci_td *nexttd;
if (!td->backptr)
return;
spin_lock_irqsave(&framelist_lock, flags);
*(td->backptr) = td->link;
if (!(td->link & (UHCI_PTR_TERM | UHCI_PTR_QH))) {
nexttd = (struct uhci_td *)uhci_ptr_to_virt(td->link);
nexttd->backptr = td->backptr;
}
spin_unlock_irqrestore(&framelist_lock, flags);
td->backptr = NULL;
/*
* attention: td->link might still be in use by the
* hardware if the td is still active and the hardware
* was processing it. So td->link should be preserved
* until the frame number changes. Don't know what to do...
* udelay(1000) doesn't sound nice, and schedule()
* can't be used as this is called from within interrupt context.
*/
/* for now warn if there's a possible problem */
if (td->status & TD_CTRL_ACTIVE) {
unsigned frn = inw(uhci->io_addr + USBFRNUM);
__u32 link = uhci->fl->frame[frn % UHCI_NUMFRAMES];
if (!(link & (UHCI_PTR_TERM | UHCI_PTR_QH))) {
struct uhci_td *tdl = (struct uhci_td *)uhci_ptr_to_virt(link);
for (;;) {
if (tdl == td) {
printk(KERN_WARNING "uhci_remove_frame_list: td possibly still in use!!\n");
break;
}
if (tdl->link & (UHCI_PTR_TERM | UHCI_PTR_QH))
break;
tdl = (struct uhci_td *)uhci_ptr_to_virt(tdl->link);
}
}
}
}
/*
* This function removes and disallocates all structures set up for a transfer.
* It takes the qh out of the skeleton, removes the tq and the td's.
* It only removes the associated interrupt handler if removeirq is set.
* The *td argument is any td in the list of td's.
*/
static void uhci_remove_transfer(struct uhci_td *td, char removeirq)
{
int maxcount = 1000;
struct uhci_td *curtd;
unsigned int nextlink;
if (td->qh && td->qh->first)
curtd = td->qh->first;
else
curtd = td;
/* Remove it from the skeleton */
uhci_remove_qh(td->qh->skel, td->qh);
uhci_qh_free(td->qh);
do {
nextlink = curtd->link;
/* IOC? => remove handler */
if (removeirq && (td->status & TD_CTRL_IOC))
uhci_remove_irq_list(td);
uhci_remove_td(curtd);
uhci_td_free(curtd);
if (nextlink & UHCI_PTR_TERM) /* Tail? */
break;
curtd = (struct uhci_td *)uhci_ptr_to_virt(nextlink);
if (!--maxcount) {
printk(KERN_ERR "runaway td's!?\n");
break;
}
} while (1);
}
/*
* Request an interrupt handler..
*
* Returns 0 (success) or negative (failure).
* Also returns/sets a "handle pointer" that release_irq can use to stop this
* interrupt. (It's really a pointer to the TD.)
*/
static int uhci_request_irq(struct usb_device *usb_dev, unsigned int pipe,
usb_device_irq handler, int period,
void *dev_id, void **handle, long bustime)
{
struct uhci_device *dev = usb_to_uhci(usb_dev);
struct uhci_td *td = uhci_td_alloc(dev);
struct uhci_qh *qh = uhci_qh_alloc(dev);
unsigned int destination, status;
if (!td || !qh) {
if (td)
uhci_td_free(td);
if (qh)
uhci_qh_free(qh);
return (-ENOMEM);
}
/* Destination: pipe destination with INPUT */
destination = (pipe & PIPE_DEVEP_MASK) | usb_packetid(pipe);
/* Infinite errors is 0, so no bits */
status = (pipe & TD_CTRL_LS) | TD_CTRL_IOC | TD_CTRL_ACTIVE | TD_CTRL_SPD;
td->link = UHCI_PTR_TERM; /* Terminate */
td->status = status;
td->info = destination | ((usb_maxpacket(usb_dev, pipe, usb_pipeout(pipe)) - 1) << 21) |
(usb_gettoggle(usb_dev, usb_pipeendpoint(pipe), usb_pipeout(pipe)) << TD_TOKEN_TOGGLE);
td->buffer = virt_to_bus(dev->data);
td->qh = qh;
td->dev = dev;
td->pipetype = PIPE_INTERRUPT;
td->bandwidth_alloc = bustime;
/* if period 0, set _REMOVE flag */
if (!period)
td->flags |= UHCI_TD_REMOVE;
qh->skel = &dev->uhci->skelqh[__interval_to_skel(period)];
uhci_add_irq_list(dev->uhci, td, handler, dev_id);
uhci_insert_td_in_qh(qh, td);
/* Add it into the skeleton */
uhci_insert_qh(qh->skel, qh);
*handle = (void *)td;
return 0;
}
/*
* Release an interrupt handler previously allocated using
* uhci_request_irq. This function does no validity checking, so make
* sure you're not releasing an already released handle as it may be
* in use by something else..
*
* This function can NOT be called from an interrupt.
*/
static int uhci_release_irq(struct usb_device *usb, void *handle)
{
struct uhci_td *td;
struct uhci_qh *qh;
td = (struct uhci_td *)handle;
if (!td)
return USB_ST_INTERNALERROR;
qh = td->qh;
/* Remove it from the internal irq_list */
uhci_remove_irq_list(td);
/* Remove the interrupt TD and QH */
uhci_remove_td(td);
uhci_remove_qh(qh->skel, qh);
if (td->completed != NULL)
td->completed(USB_ST_REMOVED, NULL, 0, td->dev_id);
/* Free the TD and QH */
uhci_td_free(td);
uhci_qh_free(qh);
return USB_ST_NOERROR;
} /* uhci_release_irq() */
/*
* uhci_get_current_frame_number()
*
* returns the current frame number for a USB bus/controller.
*/
static int uhci_get_current_frame_number(struct usb_device *usb_dev)
{
return inw (usb_to_uhci(usb_dev)->uhci->io_addr + USBFRNUM);
}
/*
* uhci_init_isoc()
*
* Allocates some data structures.
* Initializes parts of them from the function parameters.
*
* It does not associate any data/buffer pointers or
* driver (caller) callback functions with the allocated
* data structures. Such associations are left until
* uhci_run_isoc().
*
* Returns 0 for success or negative value for error.
* Sets isocdesc before successful return.
*/
static int uhci_init_isoc (struct usb_device *usb_dev,
unsigned int pipe,
int frame_count, /* bandwidth % = 100 * this / 1024 */
void *context,
struct usb_isoc_desc **isocdesc)
{
struct usb_isoc_desc *id;
int i;
*isocdesc = NULL;
/* Check some parameters. */
if ((frame_count <= 0) || (frame_count > UHCI_NUMFRAMES)) {
#ifdef CONFIG_USB_DEBUG_ISOC
printk (KERN_DEBUG "uhci_init_isoc: invalid frame_count (%d)\n",
frame_count);
#endif
return -EINVAL;
}
if (!usb_pipeisoc (pipe)) {
#ifdef CONFIG_USB_DEBUG_ISOC
printk (KERN_DEBUG "uhci_init_isoc: NOT an Isoc. pipe\n");
#endif
return -EINVAL;
}
id = kmalloc (sizeof (*id) +
(sizeof (struct isoc_frame_desc) * frame_count), GFP_KERNEL);
if (!id)
return -ENOMEM;
memset (id, 0, sizeof (*id) +
(sizeof (struct isoc_frame_desc) * frame_count));
id->td = kmalloc (sizeof (struct uhci_td) * frame_count, GFP_KERNEL);
if (!id->td) {
kfree (id);
return -ENOMEM;
}
memset (id->td, 0, sizeof (struct uhci_td) * frame_count);
for (i = 0; i < frame_count; i++)
INIT_LIST_HEAD(&((struct uhci_td *)(id->td))[i].irq_list);
id->frame_count = frame_count;
id->frame_size = usb_maxpacket (usb_dev, pipe, usb_pipeout(pipe));
/* TBD: or make this a parameter to allow for frame_size
that is less than maxpacketsize */
id->start_frame = -1;
id->end_frame = -1;
id->usb_dev = usb_dev;
id->pipe = pipe;
id->context = context;
*isocdesc = id;
return 0;
} /* end uhci_init_isoc */
/*
* uhci_run_isoc()
*
* Associates data/buffer pointers/lengths and
* driver (caller) callback functions with the
* allocated Isoc. data structures and TDs.
*
* Then inserts the TDs into the USB controller frame list
* for its processing.
* And inserts the callback function into its TD.
*
* pr_isocdesc (previous Isoc. desc.) may be NULL.
* It is used only for chaining one list of TDs onto the
* end of the previous list of TDs.
*
* Returns 0 (success) or error code (negative value).
*/
static int uhci_run_isoc (struct usb_isoc_desc *isocdesc,
struct usb_isoc_desc *pr_isocdesc)
{
struct uhci_device *dev = usb_to_uhci (isocdesc->usb_dev);
struct uhci *uhci = dev->uhci;
unsigned long destination, status;
struct uhci_td *td;
int ix, cur_frame, pipeinput, frlen;
int cb_frames = 0;
struct isoc_frame_desc *fd;
unsigned char *bufptr;
if (!isocdesc->callback_fn) {
#ifdef CONFIG_USB_DEBUG_ISOC
printk (KERN_DEBUG "uhci_run_isoc: caller must have a callback function\n");
#endif
return -EINVAL;
}
/* Check buffer size large enough for maxpacketsize * frame_count. */
if (isocdesc->buf_size < (isocdesc->frame_count * isocdesc->frame_size)) {
#ifdef CONFIG_USB_DEBUG_ISOC
printk (KERN_DEBUG "uhci_init_isoc: buf_size too small (%d < %d)\n",
isocdesc->buf_size, isocdesc->frame_count * isocdesc->frame_size);
#endif
return -EINVAL;
}
/* Check buffer ptr for Null. */
if (!isocdesc->data) {
#ifdef CONFIG_USB_DEBUG_ISOC
printk (KERN_DEBUG "uhci_init_isoc: data ptr is null\n");
#endif
return -EINVAL;
}
#ifdef NEED_ALIGNMENT
/* Check data page alignment. */
if (((int)(isocdesc->data) & (PAGE_SIZE - 1)) != 0) {
#ifdef CONFIG_USB_DEBUG_ISOC
printk (KERN_DEBUG "uhci_init_isoc: buffer must be page-aligned (%p)\n",
isocdesc->data);
#endif
return -EINVAL;
}
#endif /* NEED_ALIGNMENT */
/*
* Check start_type unless pr_isocdesc is used.
*/
if (!pr_isocdesc && (isocdesc->start_type > START_TYPE_MAX)) {
#ifdef CONFIG_USB_DEBUG_ISOC
printk (KERN_DEBUG "uhci_run_isoc: invalid start_type (%d)\n",
isocdesc->start_type);
#endif
return -EINVAL;
}
/*
* Check start_frame for inside a valid range.
* Only allow transfer requests to be made 1.000 second
* into the future.
*/
cur_frame = uhci_get_current_frame_number (isocdesc->usb_dev);
/* if not START_ASAP (i.e., RELATIVE or ABSOLUTE): */
if (!pr_isocdesc) {
if (isocdesc->start_type == START_RELATIVE) {
if ((isocdesc->start_frame < 0) || (isocdesc->start_frame > CAN_SCHEDULE_FRAMES)) {
#ifdef CONFIG_USB_DEBUG_ISOC
printk (KERN_DEBUG "uhci_init_isoc: bad start_frame value (%d)\n",
isocdesc->start_frame);
#endif
return -EINVAL;
}
} /* end START_RELATIVE */
else
if (isocdesc->start_type == START_ABSOLUTE) { /* within the scope of cur_frame */
ix = USB_WRAP_FRAMENR(isocdesc->start_frame - cur_frame);
if (ix < START_FRAME_FUDGE || /* too small */
ix > CAN_SCHEDULE_FRAMES) { /* too large */
#ifdef CONFIG_USB_DEBUG_ISOC
printk (KERN_DEBUG "uhci_init_isoc: bad start_frame value (%d,%d)\n",
isocdesc->start_frame, cur_frame);
#endif
return -EINVAL;
}
} /* end START_ABSOLUTE */
} /* end not pr_isocdesc */
/*
* Set the start/end frame numbers.
*/
if (pr_isocdesc) {
isocdesc->start_frame = pr_isocdesc->end_frame + 1;
} else if (isocdesc->start_type == START_RELATIVE) {
if (isocdesc->start_frame < START_FRAME_FUDGE)
isocdesc->start_frame = START_FRAME_FUDGE;
isocdesc->start_frame += cur_frame;
} else if (isocdesc->start_type == START_ASAP) {
isocdesc->start_frame = cur_frame + START_FRAME_FUDGE;
}
/* and see if start_frame needs any correction */
/* only wrap to USB frame numbers, the frame_list insertion routine
takes care of the wrapping to the frame_list size */
isocdesc->start_frame = USB_WRAP_FRAMENR(isocdesc->start_frame);
/* and fix the end_frame value */
isocdesc->end_frame = USB_WRAP_FRAMENR(isocdesc->start_frame + isocdesc->frame_count - 1);
isocdesc->prev_completed_frame = -1;
isocdesc->cur_completed_frame = -1;
destination = (isocdesc->pipe & PIPE_DEVEP_MASK) |
usb_packetid (isocdesc->pipe);
status = TD_CTRL_ACTIVE | TD_CTRL_IOS; /* mark Isoc.; can't be low speed */
pipeinput = usb_pipein (isocdesc->pipe);
cur_frame = isocdesc->start_frame;
bufptr = isocdesc->data;
/*
* Build the Data TDs.
* TBD: Not using frame_spacing (Yet). Defaults to 1 (every frame).
* (frame_spacing is a way to request less bandwidth.)
* This can also be done by using frame_length = 0 in the
* frame_desc array, but this way won't take less bandwidth
* allocation into account.
*/
if (isocdesc->frame_spacing <= 0)
isocdesc->frame_spacing = 1;
for (ix = 0, td = isocdesc->td, fd = isocdesc->frames;
ix < isocdesc->frame_count; ix++, td++, fd++) {
frlen = fd->frame_length;
if (frlen > isocdesc->frame_size)
frlen = isocdesc->frame_size;
#ifdef NOTDEF
td->info = destination | /* use Actual len on OUT; max. on IN */
(pipeinput ? ((isocdesc->frame_size - 1) << 21)
: ((frlen - 1) << 21));
#endif
td->dev_id = isocdesc; /* can get dev_id or context from isocdesc */
td->status = status;
td->info = destination | ((frlen - 1) << 21);
td->buffer = virt_to_bus (bufptr);
td->dev = dev;
td->pipetype = PIPE_ISOCHRONOUS;
td->isoc_td_number = ix; /* 0-based; does not wrap/overflow back to 0 */
if (isocdesc->callback_frames &&
(++cb_frames >= isocdesc->callback_frames)) {
td->status |= TD_CTRL_IOC;
td->completed = isocdesc->callback_fn;
cb_frames = 0;
uhci_add_irq_list (dev->uhci, td, isocdesc->callback_fn, isocdesc);
}
bufptr += fd->frame_length; /* or isocdesc->frame_size; */
/*
* Insert the TD in the frame list.
*/
uhci_add_frame_list(uhci, td, cur_frame);
cur_frame = USB_WRAP_FRAMENR(cur_frame+1);
} /* end for ix */
/*
* Add IOC on the last TD.
*/
td--;
if (!(td->status & TD_CTRL_IOC)) {
td->status |= TD_CTRL_IOC;
td->completed = isocdesc->callback_fn;
uhci_add_irq_list(dev->uhci, td, isocdesc->callback_fn, isocdesc); /* TBD: D.K. ??? */
}
return 0;
} /* end uhci_run_isoc */
/*
* uhci_kill_isoc()
*
* Marks a TD list as Inactive and removes it from the Isoc.
* TD frame list.
*
* Does not free any memory resources.
*
* Returns 0 for success or negative value for error.
*/
static int uhci_kill_isoc (struct usb_isoc_desc *isocdesc)
{
struct uhci_device *dev = usb_to_uhci (isocdesc->usb_dev);
struct uhci *uhci = dev->uhci;
struct uhci_td *td;
int ix;
if (USB_WRAP_FRAMENR(isocdesc->start_frame) != isocdesc->start_frame) {
#ifdef CONFIG_USB_DEBUG_ISOC
printk (KERN_DEBUG "uhci_kill_isoc: invalid start_frame (%d)\n",
isocdesc->start_frame);
#endif
return -EINVAL;
}
for (ix = 0, td = isocdesc->td; ix < isocdesc->frame_count; ix++, td++) {
/* Deactivate and unlink */
uhci_remove_frame_list(uhci, td);
td->status &= ~(TD_CTRL_ACTIVE | TD_CTRL_IOC);
} /* end for ix */
isocdesc->start_frame = -1;
return 0;
} /* end uhci_kill_isoc */
static void uhci_free_isoc (struct usb_isoc_desc *isocdesc)
{
int i;
/* If still Active, kill it. */
if (isocdesc->start_frame >= 0)
uhci_kill_isoc(isocdesc);
/* Remove all TD's from the IRQ list. */
for (i = 0; i < isocdesc->frame_count; i++)
uhci_remove_irq_list(((struct uhci_td *)isocdesc->td) + i);
/* Free the associate memory. */
if (isocdesc->td)
kfree(isocdesc->td);
kfree(isocdesc);
} /* end uhci_free_isoc */
/*
* Control thread operations: we just mark the last TD
* in a control thread as an interrupt TD, and wake up
* the front-end on completion.
*
* We need to remove the TD from the lists (both interrupt
* list and TD lists) by hand if something bad happens!
*/
static int uhci_generic_completed(int status, void *buffer, int len, void *dev_id)
{
wait_queue_head_t *wakeup = (wait_queue_head_t *)dev_id;
if (waitqueue_active(wakeup))
wake_up(wakeup);
else
printk("waitqueue empty!\n");
return 0; /* Don't re-instate */
}
/* td points to the last td in the list, which interrupts on completion */
static int uhci_run_control(struct uhci_device *dev, struct uhci_td *first, struct uhci_td *last, int timeout)
{
DECLARE_WAITQUEUE(wait, current);
struct uhci_qh *qh = uhci_qh_alloc(dev);
if (!qh)
return -1;
current->state = TASK_UNINTERRUPTIBLE;
add_wait_queue(&qh->wakeup, &wait);
uhci_add_irq_list(dev->uhci, last, uhci_generic_completed, &qh->wakeup);
uhci_insert_tds_in_qh(qh, first, last);
/* Add it into the skeleton */
uhci_insert_qh(&dev->uhci->skel_control_qh, qh);
/* wait a user specified reasonable amount of time */
schedule_timeout(timeout);
remove_wait_queue(&qh->wakeup, &wait);
/* Clean up in case it failed.. */
uhci_remove_irq_list(last);
/* Remove it from the skeleton */
uhci_remove_qh(&dev->uhci->skel_control_qh, qh);
uhci_qh_free(qh);
return uhci_td_result(dev, last, NULL, 1);
}
/*
* Send or receive a control message on a pipe.
*
* Note that the "pipe" structure is set up to map
* easily to the uhci destination fields.
*
* A control message is built up from three parts:
* - The command itself
* - [ optional ] data phase
* - Status complete phase
*
* The data phase can be an arbitrary number of TD's
* although we currently had better not have more than
* 29 TD's here (we have 31 TD's allocated for control
* operations, and two of them are used for command and
* status).
*
* 29 TD's is a minimum of 232 bytes worth of control
* information, that's just ridiculously high. Most
* control messages have just a few bytes of data.
*
* 232 is not ridiculously high with many of the
* configurations on audio devices, etc. anyway,
* there is no restriction on length of transfers
* anymore
*/
static int uhci_control_msg(struct usb_device *usb_dev, unsigned int pipe, devrequest *cmd,
void *data, int len, int timeout)
{
struct uhci_device *dev = usb_to_uhci(usb_dev);
struct uhci_td *first, *td, *prevtd;
unsigned long destination, status;
int ret, count;
int maxsze = usb_maxpacket(usb_dev, pipe, usb_pipeout(pipe));
__u32 nextlink;
unsigned long bytesrequested = len;
unsigned long bytesread = 0;
#ifdef DUMP_RAW
unsigned char *orig_data = (unsigned char *) data;
#endif
first = td = uhci_td_alloc(dev);
if (!td)
return -ENOMEM;
/* The "pipe" thing contains the destination in bits 8--18 */
destination = (pipe & PIPE_DEVEP_MASK) | USB_PID_SETUP;
/* 3 errors */
status = (pipe & TD_CTRL_LS) | TD_CTRL_ACTIVE | TD_CTRL_SPD | (3 << 27);
/*
* Build the TD for the control request
*/
td->status = status; /* Try forever */
td->info = destination | (7 << 21); /* 8 bytes of data */
td->buffer = virt_to_bus(cmd);
td->pipetype = PIPE_CONTROL;
/*
* If direction is "send", change the frame from SETUP (0x2D)
* to OUT (0xE1). Else change it from SETUP to IN (0x69).
*/
destination ^= (USB_PID_SETUP ^ USB_PID_IN); /* SETUP -> IN */
if (usb_pipeout(pipe))
destination ^= (USB_PID_IN ^ USB_PID_OUT); /* IN -> OUT */
prevtd = td;
td = uhci_td_alloc(dev);
if (!td) {
uhci_td_free(prevtd);
return -ENOMEM;
}
prevtd->link = virt_to_bus(td) | UHCI_PTR_DEPTH;
/*
* Build the DATA TD's
*/
while (len > 0) {
/* Build the TD for control status */
int pktsze = len;
if (pktsze > maxsze)
pktsze = maxsze;
/* Alternate Data0/1 (start with Data1) */
destination ^= 1 << TD_TOKEN_TOGGLE;
td->status = status; /* Status */
td->info = destination | ((pktsze - 1) << 21); /* pktsze bytes of data */
td->buffer = virt_to_bus(data);
td->backptr = &prevtd->link;
td->pipetype = PIPE_CONTROL;
data += pktsze;
len -= pktsze;
prevtd = td;
td = uhci_td_alloc(dev);
if (!td)
return -ENOMEM;
prevtd->link = virt_to_bus(td) | UHCI_PTR_DEPTH; /* Update previous TD */
}
/*
* Build the final TD for control status
*/
/* It's only IN if the pipe is out AND we aren't expecting data */
destination &= ~0xFF;
if (usb_pipeout(pipe) | (bytesrequested == 0))
destination |= USB_PID_IN;
else
destination |= USB_PID_OUT;
destination |= 1 << TD_TOKEN_TOGGLE; /* End in Data1 */
td->status = status | TD_CTRL_IOC; /* no limit on errors on final packet */
td->info = destination | (UHCI_NULL_DATA_SIZE << 21); /* 0 bytes of data */
td->buffer = 0;
td->backptr = &prevtd->link;
td->link = UHCI_PTR_TERM; /* Terminate */
td->pipetype = PIPE_CONTROL;
/* Start it up.. */
ret = uhci_run_control(dev, first, td, timeout);
count = 1000;
td = first;
do {
if (!uhci_status_bits(td->status) && ((td->info & 0xFF) ==
USB_PID_IN))
bytesread += uhci_actual_length(td->status);
nextlink = td->link;
uhci_remove_td(td);
uhci_td_free(td);
if (nextlink & UHCI_PTR_TERM) /* Tail? */
break;
td = uhci_ptr_to_virt(nextlink);
} while (--count);
if (!count)
printk(KERN_ERR "runaway td's!?\n");
if (ret && (bytesread >= bytesrequested)) {
printk(KERN_DEBUG "Recovered sufficient data (asked for %ld, got %ld) from failed cmd\n",
bytesrequested, bytesread);
ret = 0;
}
if (uhci_debug && ret) {
__u8 *p = (__u8 *)cmd;
printk("dev %d, pipe %X requested %ld bytes, got %ld, status=%d:\n",
usb_dev->devnum, pipe, bytesrequested, bytesread, ret);
printk(KERN_DEBUG "Failed cmd - %02X %02X %02X %02X %02X %02X %02X %02X\n",
p[0], p[1], p[2], p[3], p[4], p[5], p[6], p[7]);
}
#ifdef DUMP_RAW
if (!ret && usb_pipein(pipe)) { /* good Input control msg */
int i;
printk (KERN_CRIT "ctrl msg [%02x %02x %04x %04x %04x] on pipe %x returned:\n",
cmd->requesttype, cmd->request,
cmd->value, cmd->index, cmd->length, pipe);
for (i = 0; i < bytesrequested; ) {
printk(" %02x", orig_data[i]);
if (++i % 16 == 0)
printk("\n");
}
if (i % 16 != 0)
printk("\n");
}
#endif
return ret;
}
/*
* Bulk thread operations: we just mark the last TD
* in a bulk thread as an interrupt TD, and wake up
* the front-end on completion.
*
* We need to remove the TD from the lists (both interrupt
* list and TD lists) by hand if something bad happens!
*/
/* td points to the last td in the list, which interrupts on completion */
static int uhci_run_bulk(struct uhci_device *dev, struct uhci_td *first, struct uhci_td *last, unsigned long *rval, int timeout)
{
DECLARE_WAITQUEUE(wait, current);
struct uhci_qh *qh = uhci_qh_alloc(dev);
if (!qh)
return -ENOMEM;
current->state = TASK_UNINTERRUPTIBLE;
add_wait_queue(&qh->wakeup, &wait);
uhci_add_irq_list(dev->uhci, last, uhci_generic_completed, &qh->wakeup);
uhci_insert_tds_in_qh(qh, first, last);
/* Add it into the skeleton */
uhci_insert_qh(&dev->uhci->skel_bulk_qh, qh);
/* wait a user specified reasonable amount of time */
schedule_timeout(timeout);
remove_wait_queue(&qh->wakeup, &wait);
/* Clean up in case it failed.. */
uhci_remove_irq_list(last);
uhci_remove_qh(&dev->uhci->skel_bulk_qh, qh);
uhci_qh_free(qh);
return uhci_td_result(dev, last, rval, 1);
}
/*
* Send or receive a bulk message on a pipe.
*
* Note that the "pipe" structure is set up to map
* easily to the uhci destination fields.
*
* A bulk message is only built up from
* the data phase
*/
static int uhci_bulk_msg(struct usb_device *usb_dev, unsigned int pipe, void *data, int len, unsigned long *rval, int timeout)
{
struct uhci_device *dev = usb_to_uhci(usb_dev);
struct uhci_td *first, *td, *prevtd;
unsigned long destination, status;
int ret;
int maxsze = usb_maxpacket(usb_dev, pipe, usb_pipeout(pipe));
if (usb_endpoint_halted(usb_dev, usb_pipeendpoint(pipe), usb_pipeout(pipe)) &&
usb_clear_halt(usb_dev, usb_pipeendpoint(pipe) | (pipe & USB_DIR_IN)))
return USB_ST_STALL;
/* The "pipe" thing contains the destination in bits 8--18. */
destination = (pipe & PIPE_DEVEP_MASK) | usb_packetid (pipe);
/* 3 errors */
status = (pipe & TD_CTRL_LS) | TD_CTRL_ACTIVE | TD_CTRL_SPD | (3 << 27);
/*
* Build the TDs for the bulk request
*/
first = td = uhci_td_alloc(dev);
if (!td)
return -ENOMEM;
prevtd = first; // This is fake, but at least it's not NULL
while (len > 0) {
/* Build the TD for control status */
int pktsze = len;
if (pktsze > maxsze)
pktsze = maxsze;
td->status = status; /* Status */
td->info = destination | ((pktsze-1) << 21) |
(usb_gettoggle(usb_dev, usb_pipeendpoint(pipe),
usb_pipeout(pipe)) << TD_TOKEN_TOGGLE); /* pktsze bytes of data */
td->buffer = virt_to_bus(data);
td->backptr = &prevtd->link;
td->pipetype = PIPE_BULK;
data += maxsze;
len -= maxsze;
if (len > 0) {
prevtd = td;
td = uhci_td_alloc(dev);
if (!td)
return -ENOMEM;
prevtd->link = virt_to_bus(td) | UHCI_PTR_DEPTH;/* Update previous TD */
}
/* Alternate Data0/1 (start with Data0) */
usb_dotoggle(usb_dev, usb_pipeendpoint(pipe), usb_pipeout(pipe));
}
td->link = UHCI_PTR_TERM; /* Terminate */
td->status |= TD_CTRL_IOC;
/* CHANGE DIRECTION HERE! SAVE IT SOMEWHERE IN THE ENDPOINT!!! */
/* Start it up.. */
ret = uhci_run_bulk(dev, first, td, rval, timeout);
{
int count = 100;
struct uhci_td *curtd = first;
unsigned int nextlink;
do {
nextlink = curtd->link;
uhci_remove_td(curtd);
uhci_td_free(curtd);
if (nextlink & UHCI_PTR_TERM) /* Tail? */
break;
curtd = uhci_ptr_to_virt(nextlink);
} while (--count);
if (!count)
printk(KERN_DEBUG "runaway td's!?\n");
}
return ret;
}
static void * uhci_request_bulk(struct usb_device *usb_dev, unsigned int pipe, usb_device_irq handler, void *data, int len, void *dev_id)
{
struct uhci_device *dev = usb_to_uhci(usb_dev);
struct uhci *uhci = dev->uhci;
struct uhci_td *first, *td, *prevtd;
struct uhci_qh *bulk_qh = uhci_qh_alloc(dev);
unsigned long destination, status;
int maxsze = usb_maxpacket(usb_dev, pipe, usb_pipeout(pipe));
/* The "pipe" thing contains the destination in bits 8--18. */
destination = (pipe & PIPE_DEVEP_MASK) | usb_packetid(pipe);
/* Infinite errors is 0 */
status = (pipe & TD_CTRL_LS) | TD_CTRL_ACTIVE | TD_CTRL_SPD;
/* Build the TDs for the bulk request */
first = td = uhci_td_alloc(dev);
prevtd = td;
while (len > 0) {
/* Build the TD for control status */
int pktsze = len;
if (pktsze > maxsze)
pktsze = maxsze;
td->status = status;
td->info = destination | ((pktsze-1) << 21) |
(usb_gettoggle(usb_dev, usb_pipeendpoint(pipe), usb_pipeout(pipe)) << TD_TOKEN_TOGGLE); /* pktsze bytes of data */
td->buffer = virt_to_bus(data);
td->backptr = &prevtd->link;
td->qh = bulk_qh;
td->dev = dev;
td->pipetype = PIPE_BULK;
data += pktsze;
len -= pktsze;
if (len > 0) {
prevtd = td;
td = uhci_td_alloc(dev);
prevtd->link = virt_to_bus(td) | UHCI_PTR_DEPTH;
}
/* Alternate Data0/1 */
usb_dotoggle(usb_dev, usb_pipeendpoint(pipe), usb_pipeout(pipe));
}
first->backptr = NULL;
td->link = 1; /* Terminate */
td->status = status | TD_CTRL_IOC; /* IOC */
uhci_add_irq_list(dev->uhci, td, handler, dev_id);
uhci_insert_tds_in_qh(bulk_qh, first, td);
bulk_qh->skel = &uhci->skel_bulk_qh;
uhci_insert_qh(&uhci->skel_bulk_qh, bulk_qh);
/* Return last td for removal */
return td;
}
/*
* Remove a handler from a pipe. This terminates the transfer.
* We have some assumptions here:
* There is only one queue using this pipe. (the one we remove)
* Any data that is in the queue is useless for us, we throw it away.
*/
static int uhci_terminate_bulk(struct usb_device *dev, void *first)
{
/* none found? there is nothing to remove! */
if (!first)
return USB_ST_REMOVED;
uhci_remove_transfer(first, 1);
return USB_ST_NOERROR;
}
struct usb_operations uhci_device_operations = {
uhci_alloc_dev,
uhci_free_dev,
uhci_control_msg,
uhci_bulk_msg,
uhci_request_irq,
uhci_release_irq,
uhci_request_bulk,
uhci_terminate_bulk,
uhci_get_current_frame_number,
uhci_init_isoc,
uhci_free_isoc,
uhci_run_isoc,
uhci_kill_isoc
};
/*
* This is just incredibly fragile. The timings must be just
* right, and they aren't really documented very well.
*
* Note the short delay between disabling reset and enabling
* the port..
*/
static void uhci_reset_port(unsigned int port)
{
unsigned short status;
status = inw(port);
outw(status | USBPORTSC_PR, port); /* reset port */
wait_ms(10);
outw(status & ~USBPORTSC_PR, port);
udelay(5);
status = inw(port);
outw(status | USBPORTSC_PE, port); /* enable port */
wait_ms(10);
status = inw(port);
if (!(status & USBPORTSC_PE)) {
outw(status | USBPORTSC_PE, port); /* one more try at enabling port */
wait_ms(50);
}
}
/*
* This gets called if the connect status on the root
* hub (and the root hub only) changes.
*/
static void uhci_connect_change(struct uhci *uhci, unsigned int port, unsigned int nr)
{
struct usb_device *usb_dev;
struct uhci_device *dev;
unsigned short status;
struct uhci_device *root_hub = usb_to_uhci(uhci->bus->root_hub);
#ifdef UHCI_DEBUG
printk(KERN_INFO "uhci_connect_change: called for %d\n", nr);
#endif
/*
* Even if the status says we're connected,
* the fact that the status bits changed may
* that we got disconnected and then reconnected.
*
* So start off by getting rid of any old devices..
*/
usb_disconnect(&root_hub->usb->children[nr]);
status = inw(port);
/* If we have nothing connected, then clear change status and disable the port */
status = (status & ~USBPORTSC_PE) | USBPORTSC_PEC;
if (!(status & USBPORTSC_CCS)) {
outw(status, port);
return;
}
/*
* Ok, we got a new connection. Allocate a device to it,
* and find out what it wants to do..
*/
usb_dev = usb_alloc_dev(root_hub->usb, root_hub->usb->bus);
if (!usb_dev)
return;
dev = usb_dev->hcpriv;
usb_connect(usb_dev);
root_hub->usb->children[nr] = usb_dev;
wait_ms(200); /* wait for powerup */
uhci_reset_port(port);
/* Get speed information */
usb_dev->slow = (inw(port) & USBPORTSC_LSDA) ? 1 : 0;
/*
* Ok, all the stuff specific to the root hub has been done.
* The rest is generic for any new USB attach, regardless of
* hub type.
*/
if (usb_new_device(usb_dev)) {
unsigned short status = inw(port);
printk(KERN_INFO "uhci: disabling malfunctioning port %d\n",
nr + 1);
outw(status | USBPORTSC_PE, port);
}
}
/*
* This gets called when the root hub configuration
* has changed. Just go through each port, seeing if
* there is something interesting happening.
*/
static void uhci_check_configuration(struct uhci *uhci)
{
struct uhci_device *root_hub = usb_to_uhci(uhci->bus->root_hub);
unsigned int io_addr = uhci->io_addr + USBPORTSC1;
int maxchild = root_hub->usb->maxchild;
int nr = 0;
do {
unsigned short status = inw(io_addr);
if (status & USBPORTSC_CSC)
uhci_connect_change(uhci, io_addr, nr);
nr++; io_addr += 2;
} while (nr < maxchild);
}
static int fixup_isoc_desc (struct uhci_td *td)
{
struct usb_isoc_desc *isocdesc = td->dev_id;
struct uhci_td *prtd;
struct isoc_frame_desc *frm;
int first_comp = isocdesc->cur_completed_frame + 1; /* 0-based */
int cur_comp = td->isoc_td_number; /* 0-based */
int ix, fx;
int num_comp;
if (first_comp >= isocdesc->frame_count)
first_comp = 0;
num_comp = cur_comp - first_comp + 1;
#ifdef CONFIG_USB_DEBUG_ISOC
printk ("fixup_isoc_desc.1: td = %p, id = %p, first_comp = %d, cur_comp = %d, num_comp = %d\n",
td, isocdesc, first_comp, cur_comp, num_comp);
#endif
for (ix = 0, fx = first_comp, prtd = ((struct uhci_td *)(isocdesc->td))+first_comp, frm = &isocdesc->frames [first_comp];
ix < num_comp; ix++) {
frm->frame_length = uhci_actual_length (prtd->status);
isocdesc->total_length += frm->frame_length;
if ((frm->frame_status = uhci_map_status (uhci_status_bits (prtd->status),
uhci_packetout (prtd->info))))
isocdesc->error_count++;
prtd++;
frm++;
if (++fx >= isocdesc->frame_count) { /* wrap fx, prtd, and frm */
fx = 0;
prtd = isocdesc->td;
frm = isocdesc->frames;
} /* end wrap */
} /* end for */
/*
* Update some other fields for drivers.
*/
isocdesc->prev_completed_frame = isocdesc->cur_completed_frame;
isocdesc->cur_completed_frame = cur_comp;
isocdesc->total_completed_frames += num_comp; /* 1-based */
#ifdef CONFIG_USB_DEBUG_ISOC
printk ("fixup_isoc_desc.2: total_comp_frames = %d, total_length = %d, error_count = %d\n",
isocdesc->total_completed_frames, isocdesc->total_length, isocdesc->error_count);
#endif /* CONFIG_USB_DEBUG_ISOC */
return 0;
}
int uhci_isoc_callback(struct uhci *uhci, struct uhci_td *td, int status, unsigned long rval)
{
struct usb_isoc_desc *isocdesc = td->dev_id;
int ret;
/*
* Fixup the isocdesc for the driver: total_completed_frames,
* error_count, total_length, frames array.
*
* ret = callback_fn (int error_count, void *buffer,
* int len, void *isocdesc);
*/
fixup_isoc_desc (td);
ret = td->completed (isocdesc->error_count, bus_to_virt (td->buffer),
isocdesc->total_length, isocdesc);
/*
* Isoc. handling of return value from td->completed (callback function)
*/
switch (ret) {
case CB_CONTINUE: /* similar to the REMOVE condition below */
/* TBD */
uhci_td_free (td);
break;
case CB_REUSE: /* similar to the re-add condition below,
* but Not ACTIVE */
/* TBD */
/* usb_dev = td->dev->usb; */
list_add(&td->irq_list, &uhci->interrupt_list);
td->status = (td->status & (TD_CTRL_SPD | TD_CTRL_C_ERR_MASK |
TD_CTRL_LS | TD_CTRL_IOS | TD_CTRL_IOC)) |
TD_CTRL_IOC;
/* The HC removes it, so re-add it */
/* Insert into a QH? */
uhci_insert_td_in_qh(td->qh, td);
break;
case CB_RESTART: /* similar to re-add, but mark ACTIVE */
/* TBD */
/* usb_dev = td->dev->usb; */
list_add(&td->irq_list, &uhci->interrupt_list);
td->status = (td->status & (TD_CTRL_SPD | TD_CTRL_C_ERR_MASK |
TD_CTRL_LS | TD_CTRL_IOS | TD_CTRL_IOC)) |
TD_CTRL_ACTIVE | TD_CTRL_IOC;
/* The HC removes it, so re-add it */
uhci_insert_td_in_qh(td->qh, td);
break;
case CB_ABORT: /* kill/abort */
/* TBD */
uhci_kill_isoc (isocdesc);
break;
} /* end isoc. TD switch */
return 0;
}
int uhci_callback(struct uhci *uhci, struct uhci_td *td, int status, unsigned long rval)
{
if (td->completed(status, bus_to_virt(td->buffer), rval, td->dev_id)) {
struct usb_device *usb_dev = td->dev->usb;
list_add(&td->irq_list, &uhci->interrupt_list);
usb_dotoggle(usb_dev, uhci_endpoint(td->info), uhci_packetout(td->info));
td->info &= ~(1 << TD_TOKEN_TOGGLE); /* clear data toggle */
td->info |= usb_gettoggle(usb_dev, uhci_endpoint(td->info),
uhci_packetout(td->info)) << TD_TOKEN_TOGGLE; /* toggle between data0 and data1 */
td->status = (td->status & 0x2F000000) | TD_CTRL_ACTIVE | TD_CTRL_IOC;
/* The HC only removes it when it completed */
/* successfully, so force remove and re-add it. */
uhci_remove_td(td);
uhci_insert_td_in_qh(td->qh, td);
} else if (td->flags & UHCI_TD_REMOVE) {
struct usb_device *usb_dev = td->dev->usb;
/* marked for removal */
td->flags &= ~UHCI_TD_REMOVE;
usb_dotoggle(usb_dev, uhci_endpoint(td->info), uhci_packetout(td->info));
uhci_remove_qh(td->qh->skel, td->qh);
uhci_qh_free(td->qh);
if (td->pipetype == PIPE_INTERRUPT)
usb_release_bandwidth(usb_dev, td->bandwidth_alloc);
uhci_td_free(td);
}
return 0;
}
static void uhci_interrupt_notify(struct uhci *uhci)
{
struct list_head *tmp, *head = &uhci->interrupt_list;
int status;
spin_lock(&irqlist_lock);
tmp = head->next;
while (tmp != head) {
struct uhci_td *td = list_entry(tmp, struct uhci_td, irq_list);
unsigned long rval;
tmp = tmp->next;
/* We're interested if there was an error or if the chain of */
/* TD's completed successfully */
status = uhci_td_result(td->dev, td, &rval, 0);
if (status == USB_ST_NOCHANGE)
continue;
/* remove from IRQ list */
list_del(&td->irq_list);
INIT_LIST_HEAD(&td->irq_list);
if (td->pipetype == PIPE_ISOCHRONOUS) {
uhci_isoc_callback(uhci, td, status, rval);
}
else {
uhci_callback(uhci, td, status, rval);
}
/* If completed does not wants to reactivate, then */
/* it's responsible for free'ing the TD's and QH's */
/* or another function (such as run_control) */
}
spin_unlock(&irqlist_lock);
}
/*
* Check port status - Connect Status Change - for
* each of the attached ports (defaults to two ports,
* but at least in theory there can be more of them).
*
* Wake up the configurator if something happened, we
* can't really do much at interrupt time.
*/
static void uhci_root_hub_events(struct uhci *uhci, unsigned int io_addr)
{
if (waitqueue_active(&uhci_configure)) {
struct uhci_device *root_hub = usb_to_uhci(uhci->bus->root_hub);
int ports = root_hub->usb->maxchild;
io_addr += USBPORTSC1;
do {
if (inw(io_addr) & USBPORTSC_CSC) {
wake_up(&uhci_configure);
return;
}
io_addr += 2;
} while (--ports > 0);
}
}
static void uhci_interrupt(int irq, void *__uhci, struct pt_regs *regs)
{
struct uhci *uhci = __uhci;
unsigned int io_addr = uhci->io_addr;
unsigned short status;
/*
* Read the interrupt status, and write it back to clear the
* interrupt cause
*/
status = inw(io_addr + USBSTS);
if (!status) /* shared interrupt, not mine */
return;
outw(status, io_addr + USBSTS);
/* Walk the list of pending TD's to see which ones completed.. */
uhci_interrupt_notify(uhci);
/* Check if there are any events on the root hub.. */
uhci_root_hub_events(uhci, io_addr);
}
/*
* We init one packet, and mark it just IOC and _not_
* active. Which will result in no actual USB traffic,
* but _will_ result in an interrupt every second.
*
* Which is exactly what we want.
*/
static void uhci_init_ticktd(struct uhci *uhci)
{
struct uhci_device *dev = usb_to_uhci(uhci->bus->root_hub);
struct uhci_td *td = uhci_td_alloc(dev);
if (!td) {
printk(KERN_ERR "unable to allocate ticktd\n");
return;
}
/* Don't clobber the frame */
td->link = uhci->fl->frame[0];
td->backptr = &uhci->fl->frame[0];
td->status = TD_CTRL_IOC;
td->info = (15 << 21) | (0x7f << 8) | USB_PID_IN;
/* (ignored) input packet, 16 bytes, device 127 */
td->buffer = 0;
td->qh = NULL;
td->pipetype = -1;
uhci->fl->frame[0] = virt_to_bus(td);
uhci->ticktd = td;
}
static void reset_hc(struct uhci *uhci)
{
unsigned int io_addr = uhci->io_addr;
/* Global reset for 50ms */
outw(USBCMD_GRESET, io_addr + USBCMD);
wait_ms(50);
outw(0, io_addr + USBCMD);
wait_ms(10);
}
static void start_hc(struct uhci *uhci)
{
unsigned int io_addr = uhci->io_addr;
int timeout = 1000;
uhci_init_ticktd(uhci);
/*
* Reset the HC - this will force us to get a
* new notification of any already connected
* ports due to the virtual disconnect that it
* implies.
*/
outw(USBCMD_HCRESET, io_addr + USBCMD);
while (inw(io_addr + USBCMD) & USBCMD_HCRESET) {
if (!--timeout) {
printk(KERN_ERR "USBCMD_HCRESET timed out!\n");
break;
}
}
/* Turn on all interrupts */
outw(USBINTR_TIMEOUT | USBINTR_RESUME | USBINTR_IOC | USBINTR_SP,
io_addr + USBINTR);
/* Start at frame 0 */
outw(0, io_addr + USBFRNUM);
outl(virt_to_bus(uhci->fl), io_addr + USBFLBASEADD);
/* Run and mark it configured with a 64-byte max packet */
outw(USBCMD_RS | USBCMD_CF | USBCMD_MAXP, io_addr + USBCMD);
}
/*
* Allocate a frame list, and four regular queues.
*
* The hardware doesn't really know any difference
* in the queues, but the order does matter for the
* protocols higher up. The order is:
*
* - any isochronous events handled before any
* of the queues. We don't do that here, because
* we'll create the actual TD entries on demand.
* - The first queue is the "interrupt queue".
* - The second queue is the "control queue".
* - The third queue is "bulk data".
*
* We could certainly have multiple queues of the same
* type, and maybe we should. We could have per-device
* queues, for example. We begin small.
*
* Queues are dynamically allocated for devices now,
* this code only sets up the skeleton queue
*/
static struct uhci *alloc_uhci(unsigned int io_addr, unsigned int io_size)
{
int i, port;
struct uhci *uhci;
struct usb_bus *bus;
struct uhci_device *dev;
struct usb_device *usb;
uhci = kmalloc(sizeof(*uhci), GFP_KERNEL);
if (!uhci)
return NULL;
memset(uhci, 0, sizeof(*uhci));
uhci->irq = -1;
uhci->io_addr = io_addr;
uhci->io_size = io_size;
INIT_LIST_HEAD(&uhci->interrupt_list);
/* We need exactly one page (per UHCI specs), how convenient */
uhci->fl = (void *)__get_free_page(GFP_KERNEL);
if (!uhci->fl)
goto au_free_uhci;
bus = usb_alloc_bus(&uhci_device_operations);
if (!bus)
goto au_free_fl;
uhci->bus = bus;
bus->hcpriv = uhci;
/*
* Allocate the root_hub
*/
usb = usb_alloc_dev(NULL, bus);
if (!usb)
goto au_free_bus;
usb->bus = bus;
dev = usb_to_uhci(usb);
dev->uhci = uhci;
uhci->bus->root_hub = uhci_to_usb(dev);
/* Initialize the root hub */
/* UHCI specs says devices must have 2 ports, but goes on to say */
/* they may have more but give no way to determine how many they */
/* have, so default to 2 */
/* According to the UHCI spec, Bit 7 is always set to 1. So we try */
/* to use this to our advantage */
for (port = 0; port < (io_size - 0x10) / 2; port++) {
unsigned int portstatus;
portstatus = inw(io_addr + 0x10 + (port * 2));
if (!(portstatus & 0x0080))
break;
}
printk(KERN_DEBUG "Detected %d ports\n", port);
/* This is experimental so anything less than 2 or greater than 8 is */
/* something weird and we'll ignore it */
if (port < 2 || port > 8) {
printk(KERN_DEBUG "Port count misdetected, forcing to 2 ports\n");
port = 2;
}
usb->maxchild = port;
usb_init_root_hub(usb);
/*
* 9 Interrupt queues; link int2 thru int256 to int1 first,
* then link int1 to control and control to bulk
*/
for (i = 1; i < 9; i++) {
struct uhci_qh *qh = &uhci->skelqh[i];
qh->link = virt_to_bus(&uhci->skel_int1_qh) | UHCI_PTR_QH;
qh->element = UHCI_PTR_TERM;
}
uhci->skel_int1_qh.link = virt_to_bus(&uhci->skel_control_qh) | UHCI_PTR_QH;
uhci->skel_int1_qh.element = UHCI_PTR_TERM;
uhci->skel_control_qh.link = virt_to_bus(&uhci->skel_bulk_qh) | UHCI_PTR_QH;
uhci->skel_control_qh.element = UHCI_PTR_TERM;
uhci->skel_bulk_qh.link = UHCI_PTR_TERM;
uhci->skel_bulk_qh.element = UHCI_PTR_TERM;
/*
* Fill the frame list: make all entries point to
* the proper interrupt queue.
*
* This is probably silly, but it's a simple way to
* scatter the interrupt queues in a way that gives
* us a reasonable dynamic range for irq latencies.
*/
for (i = 0; i < 1024; i++) {
struct uhci_qh *irq = &uhci->skel_int2_qh;
if (i & 1) {
irq++;
if (i & 2) {
irq++;
if (i & 4) {
irq++;
if (i & 8) {
irq++;
if (i & 16) {
irq++;
if (i & 32) {
irq++;
if (i & 64) {
irq++;
}
}
}
}
}
}
}
uhci->fl->frame[i] = virt_to_bus(irq) | UHCI_PTR_QH;
}
return uhci;
/*
* error exits:
*/
au_free_bus:
usb_free_bus(bus);
au_free_fl:
free_page((unsigned long)uhci->fl);
au_free_uhci:
kfree(uhci);
return NULL;
}
/*
* De-allocate all resources..
*/
static void release_uhci(struct uhci *uhci)
{
if (uhci->irq >= 0) {
free_irq(uhci->irq, uhci);
uhci->irq = -1;
}
if (uhci->ticktd) {
uhci_td_free(uhci->ticktd);
uhci->ticktd = NULL;
}
if (uhci->fl) {
free_page((unsigned long)uhci->fl);
uhci->fl = NULL;
}
usb_free_bus(uhci->bus);
kfree(uhci);
}
static int uhci_control_thread(void *__uhci)
{
struct uhci *uhci = (struct uhci *)__uhci;
uhci->control_running = 1;
lock_kernel();
/*
* This thread doesn't need any user-level access,
* so get rid of all our resources..
*/
exit_mm(current);
exit_files(current);
strcpy(current->comm, "uhci-control");
/*
* Ok, all systems are go..
*/
do {
siginfo_t info;
int unsigned long signr;
#ifdef CONFIG_APM
if (apm_resume) {
apm_resume = 0;
start_hc(uhci);
continue;
}
#endif
uhci_check_configuration(uhci);
interruptible_sleep_on(&uhci_configure);
if (signal_pending(current)) {
/* sending SIGUSR1 makes us print out some info */
spin_lock_irq(¤t->sigmask_lock);
signr = dequeue_signal(¤t->blocked, &info);
spin_unlock_irq(¤t->sigmask_lock);
if (signr == SIGUSR1) {
printk(KERN_DEBUG "UHCI queue dump:\n");
uhci_show_queues(uhci);
} else if (signr == SIGUSR2) {
uhci_debug = !uhci_debug;
printk(KERN_DEBUG "UHCI debug toggle = %x\n",
uhci_debug);
} else
break;
}
} while (uhci->control_continue);
/*
MOD_DEC_USE_COUNT;
*/
uhci->control_running = 0;
return 0;
}
/*
* If we've successfully found a UHCI, now is the time to increment the
* module usage count, start the control thread, and return success..
*/
static int found_uhci(int irq, unsigned int io_addr, unsigned int io_size)
{
int retval;
struct uhci *uhci;
uhci = alloc_uhci(io_addr, io_size);
if (!uhci)
return -ENOMEM;
INIT_LIST_HEAD(&uhci->uhci_list);
list_add(&uhci->uhci_list, &uhci_list);
request_region(uhci->io_addr, io_size, "usb-uhci");
reset_hc(uhci);
usb_register_bus(uhci->bus);
start_hc(uhci);
uhci->control_continue = 1;
retval = -EBUSY;
if (request_irq(irq, uhci_interrupt, SA_SHIRQ, "uhci", uhci) == 0) {
int pid;
uhci->irq = irq;
pid = kernel_thread(uhci_control_thread, uhci,
CLONE_FS | CLONE_FILES | CLONE_SIGHAND);
if (pid >= 0) {
uhci->control_pid = pid;
return(pid);
}
retval = pid;
}
reset_hc(uhci);
release_region(uhci->io_addr, uhci->io_size);
release_uhci(uhci);
return retval;
}
static int start_uhci(struct pci_dev *dev)
{
int i;
/* Search for the IO base address.. */
for (i = 0; i < 6; i++) {
unsigned int io_addr = dev->resource[i].start;
unsigned int io_size =
dev->resource[i].end - dev->resource[i].start + 1;
/* IO address? */
if (!(dev->resource[i].flags & 1))
continue;
/* Is it already in use? */
if (check_region(io_addr, io_size))
break;
/* disable legacy emulation */
pci_write_config_word(dev, USBLEGSUP, USBLEGSUP_DEFAULT);
pci_enable_device(dev);
return found_uhci(dev->irq, io_addr, io_size);
}
return -1;
}
#ifdef CONFIG_APM
static int handle_apm_event(apm_event_t event)
{
static int down = 0;
switch (event) {
case APM_SYS_SUSPEND:
case APM_USER_SUSPEND:
if (down) {
printk(KERN_DEBUG "uhci: received extra suspend event\n");
break;
}
down = 1;
break;
case APM_NORMAL_RESUME:
case APM_CRITICAL_RESUME:
if (!down) {
printk(KERN_DEBUG "uhci: received bogus resume event\n");
break;
}
down = 0;
if (waitqueue_active(&uhci_configure)) {
apm_resume = 1;
wake_up(&uhci_configure);
}
break;
}
return 0;
}
#endif
int uhci_init(void)
{
int retval;
struct pci_dev *dev = NULL;
u8 type;
uhci_td_cachep = kmem_cache_create("uhci_td",
sizeof(struct uhci_td), 0,
SLAB_HWCACHE_ALIGN, NULL, NULL);
if (!uhci_td_cachep)
return -ENOMEM;
uhci_qh_cachep = kmem_cache_create("uhci_qh",
sizeof(struct uhci_qh), 0,
SLAB_HWCACHE_ALIGN, NULL, NULL);
if (!uhci_qh_cachep)
return -ENOMEM;
retval = -ENODEV;
for (;;) {
dev = pci_find_class(PCI_CLASS_SERIAL_USB << 8, dev);
if (!dev)
break;
/* Is it UHCI */
pci_read_config_byte(dev, PCI_CLASS_PROG, &type);
if (type != 0)
continue;
/* Ok set it up */
retval = start_uhci(dev);
if (retval < 0)
continue;
#ifdef CONFIG_APM
apm_register_callback(&handle_apm_event);
#endif
return 0;
}
return retval;
}
void uhci_cleanup(void)
{
struct list_head *next, *tmp, *head = &uhci_list;
int ret, i;
tmp = head->next;
while (tmp != head) {
struct uhci *uhci = list_entry(tmp, struct uhci, uhci_list);
struct uhci_device *root_hub = usb_to_uhci(uhci->bus->root_hub);
next = tmp->next;
list_del(&uhci->uhci_list);
INIT_LIST_HEAD(&uhci->uhci_list);
/* Check if the process is still running */
ret = kill_proc(uhci->control_pid, 0, 1);
if (!ret) {
/* Try a maximum of 10 seconds */
int count = 10 * 100;
uhci->control_continue = 0;
wake_up(&uhci_configure);
while (uhci->control_running && --count) {
current->state = TASK_INTERRUPTIBLE;
schedule_timeout(1);
}
if (!count)
printk(KERN_ERR "uhci: giving up on killing uhci-control\n");
}
if (root_hub)
for (i = 0; i < root_hub->usb->maxchild; i++)
usb_disconnect(root_hub->usb->children + i);
usb_deregister_bus(uhci->bus);
reset_hc(uhci);
release_region(uhci->io_addr, uhci->io_size);
release_uhci(uhci);
tmp = next;
}
if (kmem_cache_destroy(uhci_qh_cachep))
printk(KERN_INFO "uhci: not all QH's were freed\n");
if (kmem_cache_destroy(uhci_td_cachep))
printk(KERN_INFO "uhci: not all TD's were freed\n");
}
#ifdef MODULE
int init_module(void)
{
return uhci_init();
}
void cleanup_module(void)
{
#ifdef CONFIG_APM
apm_unregister_callback(&handle_apm_event);
#endif
uhci_cleanup();
}
#endif //MODULE
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